Llallagua Formation
The Llallagua Formation is a Rhuddanian to Homerian geologic formation of western Bolivia. The formation comprises siliciclastic sediments. The fossil fauna suggests a warm water, nearshore current was active allowing northern hemisphere benthos to exist in the formation.[1]
| Llallagua Formation Stratigraphic range: Rhuddanian-Homerian ~443–428 Ma | |
|---|---|
| Type | Geological formation |
| Underlies | Kirusillas Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Coordinates | 17.8°S 64.8°W |
| Approximate paleocoordinates | 46.5°S 127.9°W |
| Region | Potosí Department |
| Country |  |
| Extent | Cordillera Oriental |
| Type section | |
| Named for | Llallagua |
  Llallagua Formation (Bolivia) | |
Fossil content
Early Silurian (470 Ma)
Early Devonian (400 Ma)
The formation has provided the following fossils:
- Atrypa reticularis
- Leptaena rhomboidalis
- Orthostrophia cf. dartae
- Chonetes sp.
- Dalejina sp.
- Dalmanites sp.
- Orthostrophella sp.
- Plectodonta sp.
- Protochonetes sp.
- Syntrophia sp.
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References
- Llallagua Formation at Fossilworks.org
Further reading
- G. Laubacher, A. J. Boucot, and J. Gray. 1982. Additions to Silurian stratigraphy, lithofacies, biogeography and paleontology of Bolivia and southern Peru. Journal of Paleontology 56(5):1138-1170
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